kingdoms warning

[14:18:38 WARN]: [ApeironKingdoms] Doing an operation on the main thread that should be done async!
java.lang.Throwable: null
        at me.crz.minecraft.kingdoms.utils.Utils.catchSync(Utils.java:264) ~[?:?]
        at me.crz.minecraft.kingdoms.db.MySqlDatabaseManager.getResident(MySqlDatabaseManager.java:572) ~[?:?]
        at me.crz.minecraft.kingdoms.village.ResidentManager.lambda$new$1(ResidentManager.java:71) ~[?:?]
        at me.crz.minecraft.kingdoms.libs.caffein.cache.BoundedLocalCache$BoundedLocalLoadingCache.lambda$new$0(BoundedLocalCache.java:3366) ~[?:?]
        at me.crz.minecraft.kingdoms.libs.caffein.cache.BoundedLocalCache.lambda$doComputeIfAbsent$14(BoundedLocalCache.java:2064) ~[?:?]
        at java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1877) ~[?:1.8.0_181]
        at me.crz.minecraft.kingdoms.libs.caffein.cache.BoundedLocalCache.doComputeIfAbsent(BoundedLocalCache.java:2037) ~[?:?]
        at me.crz.minecraft.kingdoms.libs.caffein.cache.BoundedLocalCache.computeIfAbsent(BoundedLocalCache.java:2020) ~[?:?]
        at me.crz.minecraft.kingdoms.libs.caffein.cache.LocalCache.computeIfAbsent(LocalCache.java:112) ~[?:?]
        at me.crz.minecraft.kingdoms.libs.caffein.cache.LocalLoadingCache.get(LocalLoadingCache.java:67) ~[?:?]
        at me.crz.minecraft.kingdoms.village.ResidentManager.getResident(ResidentManager.java:133) ~[?:?]
        at me.crz.minecraft.kingdoms.command.village.VillageInviteCommand.run(VillageInviteCommand.java:21) ~[?:?]
        at me.crz.minecraft.kingdoms.command.ResidentSubCommand.run(ResidentSubCommand.java:18) ~[?:?]
        at me.crz.minecraft.kingdoms.command.SubCommand.execute(SubCommand.java:61) ~[?:?]
        at me.crz.minecraft.kingdoms.command.SubCommand.execute(SubCommand.java:55) ~[?:?]
        at me.crz.minecraft.kingdoms.command.CommandManager.onCommand(CommandManager.java:51) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:151) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchCommand(CraftServer.java:729) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PlayerConnection.handleCommand(PlayerConnection.java:1757) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1561) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:12) ~[patched_1.13.2.jar:git-Paper-402]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_181]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_181]
        at net.minecraft.server.v1_13_R2.SystemUtils.a(SystemUtils.java:109) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1016) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:943) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:841) ~[patched_1.13.2.jar:git-Paper-402]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]